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My question is twofold. First, how is a brake caliper remanufactured and what prohibits me from rebuilding it myself? I've been burned on a replacement so I just rather reuse the one that fits right.
While I agree that the aftermarket rebuilds are cheap and probably easiest AND I strongly agree to replace your brake hoses especially if you can confirm that they have many miles on them. Internal collapse of the walls of the hoses have chewed up a lot of pads on a lot of old cars, let me also put a plug in for rebuilding them yourself since you asked what stops you from doing it.

I don't like the plastic or ceramic pistons and would try to get a steel piston kit; honing the piston bore can be done with a hone purchased from the auto parts store or if the bore is not pitted badly it can be cleaned with crocus cloth strips using a little brake fluid to flush out the particulates as they accumulate. A new square cut seal and a dust boot is provided in the kit. The dust boot can be a trick on some of the old Chrysler cars as one must get the boot to retract with the piston and the piston must be seated in the bore to accomodate new pads and getting that step in tandem (use a C-clamp of the appropriate size and an old brake pad or block of wood over the piston to avoid dinging the piston) as the piston is forced home (wet down the walls of the cylinder bore with new brake fluid).

I have done this a few times and always had good results. YMMV.
 

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My car had 105000 when I got it in march and the power brakes havn't worked since ive owned it, so 4000 miles later I've just been pretending it's 1961 and no power brakes is normal. I've bled the Heck out of the system and the pedals firm but needs good force for a sudden stop, it may be the real reason for sticky calipers. I'm going to do it before winter
Have you checked the vacuum power assist booster system? It is possible that somebody plugged the vacuum line or the diaphragm is internally torn. See the board for troubleshooting them after you do a visual check to make sure the vacuum hose is hooked up and supplying vacuum to the booster.
 
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